make sure bias is 1D and has size of M

Author: lei-Qiao

tf2onnx/optimizer/transpose_optimizer.py

@@ -385,9 +385,10 @@ def _add_handler(self, trans, node):
                 if len(numpy_val.shape) - numpy_val.shape.count(1) > 1:
                     self.logger.debug("Bias is not 1D, can not merge Conv and Add")
                     return self._handle_node_having_branches(node)
+
                 bias_size = max(numpy_val.shape)
-                M = t_p.inputs[1].output_shapes[0][0]
-                if bias_size != M:
+                size_m = t_p.inputs[1].output_shapes[0][0]
+                if bias_size != size_m:
                     self.logger.debug("Bias size is not M, can not merge Conv and Add")
                     return self._handle_node_having_branches(node)